* {
    margin: 0;
    padding: 0;
}

.minw {
    width: 100%;
    min-width: 200px;
}

.wauto {
    width: 400px;
    height: 600px;
    margin: 100px auto;
    background: pink;
    overflow: hidden;
}
.soul {
    width: 386px;
    height: 100px;
    line-height: 100px;
    font-size: 25px;
    border: 2px solid black;
    margin: 5px;
    text-align: right;
}

button {
    width: 86px;
    height: 86px;
    margin: 5px;
    border: 2px solid black;
    background: greenyellow;
    font-size: 20px;
    cursor: pointer;
}
button:last-child {
    width: 186px;
}